Friction brake



June 5,1928. Y l 1,672,314

J. H. HALL FRICTION BRAKE Original Filed Oot. 5, 1925 A'TTORNEY Patented June 5, 19,28.

JAY H. HALL, or CLEVELAND HEIGHTS,

oFoHIo.. .l

` i v onrog assi'GNoa T'jo 'inn ELECTRIC icoN- i TEQLLER a MANUFACTUEINGCOMPANY, oF CLEVELAND, .OHIQJA CORPORATION l ERICTIQN' BRAKE;

Application filed Octoberv 5, 1925,v Serial No; 60,417'. Renewed October l18,11927.`

My invention relates yto yfriction brakes, and more Vparticularly to brakes of the spring-applied and electromagnetically-released type. However, certain features are applicable to friction brakes of yother types.

It is one of the. objects of this vinvention-to construct and arrange the-parts so that the brake-drum or -Wheel can be removed Without removing any otherpairtofA the brake mechanism orclistunbing any of the adjust-y ments. Another objectof the invention iste arrange the operatinglevers and brakeshoe supports so -that the-.bearings are contained in the frame or supporting Vcasting below7 thev center of the brakefwheel, Awhereby the said frame may beof simple design and may be made'sufhcientl'y strong Without using. an excessive amount of material therein. -My invention furtherrelates toqcombinations of various levers, and `their relations to ther brake-shoes, and -toy their lever-actuating means, as hereinafter pointed out in vmore detail. Other objects-appear hereinafter.

Referring tothe accompanying drawings, Fig'. 1 isa side view7 With thebearings `for the brakeWheel shaft omitted; IFig. 2, ja section on4 the lineII.-II on Il ignlgA and Fig. 3, an elevation of Fig. 1f, .looking to the left, the right end of theframe'being lefty olf and parts being in section. y

Referring to the draw-ings, 1 designates a metal frame or casting having the spacedapart sides 2, preferablytied together centrally bythe Web 3. f f

4 designates the brake-Wheel.- or drum keyed to 'the shaft 5, the bearingsfor the latter being omitted.. The brake-Wheel turns betweenthe .tvvo brake-shoes 6 and. 7, the` former being supportedv by the pivot'.l pin 8y in the. upper end ofithe lever 9 pivotedbein theupstanding ears 11.V on the. right hand end. of the frame'l andr on therear yportions of the righthand endsvofthevsides-2.

The left shoe 7 is-pivotally supportedsby the. pin orpivot l'-extending throughutlie 1 shoe and they upperends ofthetwo'oscillat- `able supports or. bars 1.4- joined by ai web. 14a between which 'bars the shoe 'is situated. Thevlower encls'yof the supports 14 .are pix" ot'ed en the pin 15' inthe'vsidesQf tween Aits ends on the pivotvpinlO supported properlyl setting-or 'appyingtlre brake-slime. tach'ed to theweb 3 an' `yche ..16 isv'an electromagnet standing atftle left of the vshoe Zandhaving' its right 'hand y.

portion supportedby the pingl and. its left yhand' portion by the set-screw 1,7 -Workinghin the/lug *18'y ont-he back face of thel electrol magnet and engaging they lug. 1-9 onlthe end 2O ofthe frame 1. YThe electromagnet is so tilted that its activeA or larmature-attracting face 21 is inclined downwardly and towards the right] y The armature y22 of.l the. magnet' ispivoted on .thel pin 1.5 and is ypivota'lly-conneetedfby the pin oir pivot 23 vto/,an intel-'mediatepor` Vtion-of the lever 24E Whose upper'end isf pivoteli on the pin 13y 'and` `Whose lower' Aend carries thepin `or pivot 25.y Thev link `L26ha'sone 4end vpivoted onfthe-pin 25 and thev other on the pin yor pivot-27 inthe .lower 'end' ofthe lever 9. One sideA of the frame 1 has the notch28 through which the .-pi'n'27 projects. l

The vframe 1 has at the left'sidegoff the .notch the lug 29 Vinwvhichthe set-screw 30 Works, its right hand end being engageable the pin 27 upon completion of the opening movement ofthe'- shoes to limitA isuch 'movement The degree. ofv thisl movement can be regulated by tihefsetfscrew 3,0.

The levers 9 andf24- carry the usual ad- `justing vset-screws. 31 and 32 engageable with' the outerv faces of the lower `endfsfbli t-he brake-shoes Gand 7to prevent theupper ends 1 of theshoes from` tipping; forward when the shoesare released. ly The upper end joff .the armature 22 is provided with theipinBSJ-carrying thescrew threadedl 35 through the intermediatel lblockapivoted onv tlepin 33.11v` llliefouter end .of the 'rodpaissesfmmugh yth'elug 36 on the backupperportionl of the electromagn'et "16: A2 mit` 37 hav-ing the handle' 38a works' on the outer end of the'rod 35 and is engageable with the outer face of the'lu'g" 36.; A

' helicalt spring" 39l surrounds the Iodr S55-and has one end engaging the* inner o'r right face fof-the lug 36 ,and the other fend; engaging, the.

Washer 40 held *on therod 'in'any'idesired adjustment `by the111uty 41 se as 'tb ,giveV the spring39".thel required expai'sive'forcefor '1.00

lever 9 for causing'the pin 27 to engage the set-screw ,'30 and for ensuring that both brake-shoes will be opened fully and equally.

The drawings show the armature 22' open vand the spring 39 causing the brake to be set. The yspring forces the armature to the right. n the right causes the pin 23 to move to the right, the lever 24. and the linlr 26 being moved to the right at the same time.

both brake-shoes to the bral e-wheel with equal pressure.` At the saine time the spring vi2 isy stretched and Vvthe pin 27 is moved away 'from the set-screw 30. n

Upon the energization ofthe electromag- V net the'iarmature isv swung to the left on Fig. 1,causing.the lever 24- and the linkv 26 to move in the/same direction. ,When the.

pin 27'y engagesthe set-screw 30, as before described, both brake-shoes are released.

`When vit is desired to remove the brakewheel, itis necessary to release theI shaft 5 from` its bearings, not shown, and' to lift the brake-'wheel dire'tly. upwards. The hrake-shoes will turnf'freely outward so as to 'allow the brake-wheel to pass easily upwardly moving causing magnet magnet easily replaced byl proceeding in the reversel order.

AAs the brake-shoes wear, the air gap between the magnet and armature increases. The set-screw 17 allows the Yinclination of the magnet to vbe adjusted to change the air gap between the magnet and armature. The

.mounting ofthe magnet on thel pinfl at lsome distance forwardly of theV center of gravity of the magnetI tends to hold the magnet from, moving, it being intended'that itshall remain' stationary when the Varmature IDOVQS.

I claim:m l r In a friction.brake,l two brake-shoes arranged to engage the periphery of the brakeedruni atopposite sides ofthe shaft,`

a frame, and means supported by theframe for supporting and operating the brake- MshOes, the -frame and the said means pertween the brake-shoes.,

mitting at all times thevfree movement of the brake-drum laterally entirelyfrom be- 2. In a. friction brake, a shaft, avbrakerIlhe swinging of the armature to These `movements cause the levers 9 and 24 to apply drum thereon, twoV brake-shoes arranged at opposite sides of the shaft and adapted to v lfrictionally engage the periphery of the` drum, and means for supporting andl operating the brake-slioes,'the said means being ar-y ranged so that the brake-drum maybe removed. transversely from between the brakeshoes without l,removing any element vor y changing any adjustment. y y

`3. In a friction brake, a shaft, a brakedrum thereon, two brake-shoes arranged at opposite sides of the shaft and adapted to frictionally engage ythe peripheryk of the drum, and means for supporting and operating the brake-shoes, the said lmeans being arranged at only three sides of the brake-l d'rum,`leaving the remaining side free for the passage of the brake-drum laterally from between the brake-shoes.

4. In a friction brake, a brake-drum, two brake-shoes arranged at opposite sides ofthe drum and adapted to frictionally engage the same, a framel beneath the `braledrum,. a

lever supported between its ends byA the frame and supporting'at one end one of the .brake-shoes, a second'lever connected at'one end to the remaining brake-shoe, means operatively connecting together the remainling ends of the levers, means supported by the frame'and supporting the second brakeshoe, `and means for applying force tov` an intermediate yportion ofthe second 4lever in` one direction to cause vthe brake-shoes to 'be released from the brake-drum, and in the opposite direction to 'cause the brake-shoes to be appliedl tov the' brake-drum.`

5.'In a friction brake, a'bial e-'drii m ,f'two brake-shoesarranged at opposite sides of the drum and adapted torfrictionally engage'the same, a `frame beneath the brake-drum, a lever supported between its ends bythe frame and' supporting at one 4end one of the brake-shoes, a second lever connccted'at one end to the remaining brakeshoe, means operatively connecting togetherthe remaining ends ofthe levers-.and means for applying force to an intermediate Aport-ion of these@ `o nd lever in one'direction to cause the brakeshoes tol vhe released from the brake-drum, l

and in the opposite ldirection to cause the brake-shoes to be applied to the hravkesdrum. 6.Y Ina friction brake, two brake-shoes', `vva `brake-drum"between them, a lever Vpivoted vbetween'its ends and supporting at one end one bral eshoe, an arm -pivoted atfoneend and'supporting the remaining brake-shoe at ilo the other end, and'- means applied to thel remaining end of the lever and to the second brake-shoe for actuating bothbrake-shoes; f

y''. Ina friction brake, two lbrake-shoes, a

brake-drum 'between them, a lever ypivotedy vbetween its ends and supportingat one end one brake-shoe, an arm pivoted at one end and supportingthe remaining brake-shoe at the other end, a lever connected at one endv to the second brake shoe and at the other to the remaining end of the rst lever, and.

means operating on an intermediate por-tion of the second lever for actuating the levers and the brake-shoes.

8. In a friction brake, two brake-shoes, a brake-drum between them, a lever pivoted between its ends and supporting at one end one brake-shoe7 an arm pivoted at one end and supporting the remaining brake-shoe at the other end, a lever connected 'at one end to the second brake-shoe and at the other to the remaining` end of the first lever, and an eiectromagnet having an armature operating` on an intermediate portion of the second lever for actuating the levers and brakeshoes.

9. In a friction brake, two brake-shoes, a brake-drum between them, a lever pivoted between its ends and supporting at one end one brake-shoe, an arm pivoted at one end and supporting the remaining brake-shoe at the other end, a lever connected at one end to the second brake-shoe and at the other to the remaining end of the first lever, an electromagnet and an armature therefor pivoted concentrically therewith 'and oper-at.- ing` on an intermediate portion of the second lever for actuating the levers .and brakeshoes.

10. In a friction brake, 'two brake-shoes,

a brake-drum between them, aV lever pivoted between its ends and supporting at one end one brake-shoe, -an arm pivoted at one endA and supporting the remaining lbrake-shoe at the other end, a lever connected at one end to the second brake-shoeV and at the other to the remaining end of the first lever, an electromagnet, an armature therefor pivoted concentrically therewith and with the pivot for the arm and operating on an intermediate portion of the second lever for actuating the levers and brake-shoes.

ll. In a friction brake, two brake-shoes, a brake-drum between them, a frame beneath the drum, two substantially vertical pivoted bars supporting at their upper ends the 'side of the yplane and operatively connecting the levers, and actuating means for the brake-shoes arranged wholly laterally of the brake drum.

13. In a friction brake,'a brake-drun'i, two brake-shoes arranged at opposite sides of the drum and adapted to frictionally engage the same, a lever pivoted between its ends and supporting at one end 'one ofthe brakeshoes, a second lever connected at one end to the remaining brake-shoe, means operatively connecting together the remaining ends of the levers, and means for applying force to an intermediate portion of the second lever in one direction to cause the brakeshoes to be released from the brake-drum, and in the opposite direction to cause the brake-shoes to be applied to the brake-drum- 14. In a friction brake, a brake drum, two

brake-shoes arranged at opposite sides of the drum and'adapted to frictionally engage the same, a lever supported between its ends and supporting at one end one of the brake-shoes, a second lever connected at one end to the remaining brake-shoe, means operatively connecting together the remaining ends of the levers, and-means for applying force to an intermediate portion of the second lever in one direction to cause the bral e` shoes to be released from the brake-drum, and in the opposite direction to cause the brake-shoes to be applied to the brake-drum.

In testimony whereof, I hereunto subscribey my name.

JAY HLHALL. 

